Enable #nullable for NATS transport.

src/DotNetCore.CAP.NATS/CAP.NATSOptions.cs

@@ -27,9 +27,9 @@ namespace DotNetCore.CAP
         /// <summary>
         /// Used to setup all NATs client options
         /// </summary>
-        public Options Options { get; set; }
+        public Options? Options { get; set; }
 
-        public Action<StreamConfiguration.StreamConfigurationBuilder> StreamOptions { get; set; }
+        public Action<StreamConfiguration.StreamConfigurationBuilder>? StreamOptions { get; set; }
 
         public Func<string, string> NormalizeStreamName { get; set; } = origin => origin.Split('.')[0];
     }

src/DotNetCore.CAP.NATS/CAP.Options.Extensions.cs

@@ -3,7 +3,6 @@
 
 using System;
 using DotNetCore.CAP;
-using JetBrains.Annotations;
 
 // ReSharper disable once CheckNamespace
 namespace Microsoft.Extensions.DependencyInjection
@@ -15,7 +14,7 @@ namespace Microsoft.Extensions.DependencyInjection
         /// </summary>
         /// <param name="options">CAP configuration options</param>
         /// <param name="bootstrapServers">NATS bootstrap server urls.</param>
-        public static CapOptions UseNATS(this CapOptions options, [CanBeNull] string bootstrapServers = null)
+        public static CapOptions UseNATS(this CapOptions options, string? bootstrapServers = null)
         {
             return options.UseNATS(opt =>
             {

src/DotNetCore.CAP.NATS/DotNetCore.CAP.NATS.csproj

@@ -2,16 +2,10 @@
 
   <PropertyGroup>
     <TargetFramework>netstandard2.1</TargetFramework>
-    <AssemblyName>DotNetCore.CAP.NATS</AssemblyName>
+	<Nullable>enable</Nullable>
     <PackageTags>$(PackageTags);NATS</PackageTags>
   </PropertyGroup>
 
-  <PropertyGroup>
-    <WarningsAsErrors>NU1605;NU1701</WarningsAsErrors>
-    <NoWarn>NU1701;CS1591</NoWarn>
-    <DocumentationFile>bin\$(Configuration)\netstandard2.1\DotNetCore.CAP.NATS.xml</DocumentationFile>
-  </PropertyGroup>
-
   <ItemGroup>
     <PackageReference Include="NATS.Client" Version="0.14.1" />
   </ItemGroup>

src/DotNetCore.CAP.NATS/NATSConsumerClient.cs

@@ -21,7 +21,7 @@ namespace DotNetCore.CAP.NATS
         private readonly string _groupId;
         private readonly NATSOptions _natsOptions;
 
-        private IConnection _consumerClient;
+        private IConnection? _consumerClient;
 
         public NATSConsumerClient(string groupId, IOptions<NATSOptions> options)
         {
@@ -29,15 +29,17 @@ namespace DotNetCore.CAP.NATS
             _natsOptions = options.Value ?? throw new ArgumentNullException(nameof(options));
         }
 
-        public event EventHandler<TransportMessage> OnMessageReceived;
+        public event EventHandler<TransportMessage>? OnMessageReceived;
 
-        public event EventHandler<LogMessageEventArgs> OnLog;
+        public event EventHandler<LogMessageEventArgs>? OnLog;
 
-        public BrokerAddress BrokerAddress => new BrokerAddress("NATS", _natsOptions.Servers);
+        public BrokerAddress BrokerAddress => new ("NATS", _natsOptions.Servers);
 
         public ICollection<string> FetchTopics(IEnumerable<string> topicNames)
         {
-            var jsm = _consumerClient.CreateJetStreamManagementContext();
+            Connect();
+
+            var jsm = _consumerClient!.CreateJetStreamManagementContext();
 
             var streamGroup = topicNames.GroupBy(x => _natsOptions.NormalizeStreamName(x));
 
@@ -80,7 +82,7 @@ namespace DotNetCore.CAP.NATS
 
             Connect();
 
-            var js = _consumerClient.CreateJetStreamContext();
+            var js = _consumerClient!.CreateJetStreamContext();
 
             foreach (var subject in topics)
             {
@@ -106,7 +108,7 @@ namespace DotNetCore.CAP.NATS
 
         private void Subscription_MessageHandler(object sender, MsgHandlerEventArgs e)
         {
-            var headers = new Dictionary<string, string>();
+            var headers = new Dictionary<string, string?>();
 
             foreach (string h in e.Message.Header.Keys)
             {
@@ -126,7 +128,7 @@ namespace DotNetCore.CAP.NATS
             }
         }
 
-        public void Reject(object sender)
+        public void Reject(object? sender)
         {
             if (sender is Msg msg)
             {
@@ -153,7 +155,7 @@ namespace DotNetCore.CAP.NATS
                 if (_consumerClient == null)
                 {
                     var opts = _natsOptions.Options ?? ConnectionFactory.GetDefaultOptions();
-                    opts.Url = _natsOptions.Servers ?? opts.Url;
+                    opts.Url ??= _natsOptions.Servers;
                     opts.ClosedEventHandler = ConnectedEventHandler;
                     opts.DisconnectedEventHandler = ConnectedEventHandler;
                     opts.AsyncErrorEventHandler = AsyncErrorEventHandler;